SOLUTION: There are 126 different figures that can be formed using four of the 9 dots in the figure below. . . . . . . . . . What is the probability that if you sele

Question 143778: There are 126 different figures that can be formed using four of the 9 dots in the figure below.
. . .
. . .
. . .
What is the probability that if you select four dots at random and connect them, the figure will be a square? Any help would be great. Thanks

Answer by oscargut(2103) (Show Source): You can put this solution on YOUR website!
if we put numbers at the 9 points
1*2*3*
4*5*6*
7*8*9*
you can form squares using:
1245
2356
4578
5689
1379
2468

then you can form 6 squares so probability is 6/126 =1/21

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